Oligodendroglial Tumours begin in the brain cells called oligodendrocytes, which support and nourish nerve cells. Grades of oligodendroglial Tumours include the following:

Oligodendroglioma (grade II): Oligodendrogliomas are slow-growing Tumours with cells that look very much like normal cells. These Tumours occur most often in patients between the ages of 40 and 60 years.